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       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.


       ftw.h — file tree traversal


       #include <ftw.h>


       The  <ftw.h>  header  shall  define  the  FTW  structure, which shall include at least the
       following members:

           int  base
           int  level

       The <ftw.h> header shall define the following symbolic constants for use as values of  the
       third  argument to the application-supplied function that is passed as the second argument
       to ftw() and nftw():

       FTW_F         Non-directory file.

       FTW_D         Directory.

       FTW_DNR       Directory without read permission.

       FTW_DP        Directory with subdirectories visited.

       FTW_NS        Unknown type; stat() failed.

       FTW_SL        Symbolic link.

       FTW_SLN       Symbolic link that names a nonexistent file.

       The <ftw.h> header shall define the following symbolic constants for use as values of  the
       fourth argument to nftw():

       FTW_PHYS      Physical  walk,  does  not  follow symbolic links. Otherwise, nftw() follows
                     links but does not walk down any path that crosses itself.

       FTW_MOUNT     The walk does not cross a mount point.

       FTW_DEPTH     All subdirectories are visited before the directory itself.

       FTW_CHDIR     The walk changes to each directory before reading it.

       The following shall be declared as functions and may also be defined as  macros.  Function
       prototypes shall be provided.

           int ftw(const char *, int (*)(const char *, const struct stat *,
               int), int);
           int nftw(const char *, int (*)(const char *, const struct stat *,
               int, struct FTW *), int, int);

       The  <ftw.h> header shall define the stat structure and the symbolic names for st_mode and
       the file type test macros as described in <sys/stat.h>.

       Inclusion of the <ftw.h> header may also make visible all symbols from <sys/stat.h>.

       The following sections are informative.









       The System Interfaces volume of POSIX.1‐2008, ftw(), nftw()


       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2013  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013  by  the
       Institute  of  Electrical  and  Electronics  Engineers,  Inc and The Open Group.  (This is
       POSIX.1-2008 with the  2013  Technical  Corrigendum  1  applied.)  In  the  event  of  any
       discrepancy  between  this  version and the original IEEE and The Open Group Standard, the
       original IEEE and The Open Group Standard is the referee document. The  original  Standard
       can be obtained online at .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
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